Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/es-toolkit/dist/compat/object/functions.js

@@ -0,0 +1,29 @@
+const require_keys = require("./keys.js");
+//#region src/compat/object/functions.ts
+/**
+* Creates an array of property names from an object where the property values are functions.
+*
+* Only checks for own properties with string keys. Inherited properties or
+* properties with Symbol keys are not included.
+*
+* @param object The object to inspect.
+* @returns An array of function property names.
+*
+* @example
+*
+* function Foo() {
+*   this.a = () => 'a'
+*   this.b = () => 'b'
+* }
+*
+* Foo.prototype.c = () => 'c'
+*
+* functions(new Foo)
+* // => ['a', 'b']
+*/
+function functions(object) {
+	if (object == null) return [];
+	return require_keys.keys(object).filter((key) => typeof object[key] === "function");
+}
+//#endregion
+exports.functions = functions;